EP1468806A1 - Method of obtaining flanged, coated plastic parts - Google Patents

Method of obtaining flanged, coated plastic parts Download PDF

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Publication number
EP1468806A1
EP1468806A1 EP01275058A EP01275058A EP1468806A1 EP 1468806 A1 EP1468806 A1 EP 1468806A1 EP 01275058 A EP01275058 A EP 01275058A EP 01275058 A EP01275058 A EP 01275058A EP 1468806 A1 EP1468806 A1 EP 1468806A1
Authority
EP
European Patent Office
Prior art keywords
coating
frame
flanged
flanging
coated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01275058A
Other languages
German (de)
French (fr)
Other versions
EP1468806B1 (en
Inventor
Bertrand Le Claire
Javier Gomez Mimbiela
Pablo Escribano Andres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grupo Antolin Ingenieria SA
Original Assignee
Grupo Antolin Ingenieria SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grupo Antolin Ingenieria SA filed Critical Grupo Antolin Ingenieria SA
Publication of EP1468806A1 publication Critical patent/EP1468806A1/en
Application granted granted Critical
Publication of EP1468806B1 publication Critical patent/EP1468806B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14196—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14196—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
    • B29C2045/14204—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part the edges formed by an intermediate mould part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14262—Clamping or tensioning means for the insert
    • B29C2045/1427—Clamping or tensioning means for the insert controlling the slip of the insert

Definitions

  • the invention relates to the obtaining of injected plastic parts in the interior of a mould, which are coated and flanged inside the mould itself during the injection phase.
  • this coating adapts to the shape of the part, with the profile of the cut in the fabric remaining visible on the sharp edges of the part.
  • the fabric has a greater surface area than is strictly necessary in order to cover the side of the part that is to be covered, making it possible therefore to pass the surplus part of the said fabric over the sharp edges and thus to join it, by different means or methods, to the unseen side of the part.
  • this operation is called flanging.
  • This operation is carried out after the injection, as another different process outside the injection machine and the mould. It is normally carried out by means of several techniques, among which we can point out:
  • the object of the invention is to provide a process to obtain coated and flanged plastic parts in which the flanging of the coating is carried out inside the injection mould and at the same time as the injection itself, without the need for any tooling in addition to the mould nor for any operations other than the injection process.
  • the invention uses, as with the traditional technique, a mould for plastic injection, set up in an injection machine.
  • the mould is composed of a fixed part, a mobile part and a frame.
  • the coating suitably cut in terms of the geometry and development of the figure of the mould, is placed between the frame and the fixed part of the mould is placed. This suitably cut coating will be called "format”.
  • the first part of the mould that moves is the frame, which is to be supported on the fixed part of the mould, with the format thus remaining fixed onto the said fixed part.
  • the areas where the format comes into contact with the mould in the space between the frame and the fixed part must guarantee that it can slide, based on it being polishing, having a slide treatment, etc.
  • the mobile part is moved against the frame in order to close the mould and be able to begin the injection process.
  • the plastic in a melted state enters into the cavity in the mould for the part, reaching the format in such a way that, due to the injection pressure, the molten material gradually fills the cavity, pushing the coating so that it adapts top the geometry or shape of the said cavity.
  • the molten plastic gives a shape to the coating depending on the geometry of the cavity, with the flanging of this coating onto the part taking place as it adapts to this cavity.
  • the flanging takes place due to the specific geometry of the mobile part of he mould and of the frame, which forms another item claimed by the present invention.
  • the mobile part has the geometry of half of the cross section of the flanging area of the part to be flanged, while the frame has the geometry of the other half of the cross section of the flanging area of the part to be flanged, so that the front part, the sides and/or perimeter and at least a rear portion of the part to be coated become covered with the coating, without the need for any complementary operation in order to create the said flanging which is different from that of the injection phase.
  • the fixed part provides one side of the geometry or shape of the part (5).
  • the frame has the geometry of the perimeter of the part and adjusts to the fixed part while leaving a passage through the hole (8).
  • the said frame includes one part of the flanging area (7).
  • the frame has approached the fixed part (1), pre-shaping the coating (4) and providing a distance (9) between both which allows the sliding of the format and prevents the molten plastic material from leaving.
  • the closing of the mobile part (2) of the mould onto the said assembly, Fig. 3, allows us to appreciate the establishment of the interior cavity (6, 7), carried out in two halves, one (6) for the mobile part and another (7) for the frame.
  • the coating (4) remains trapped between the frame (3) and the fixed part (1), maintaining the separation distance (9) between the facing surfaces of these latter two parts, and with one portion of the coating having access to the interior of the cavity (6, 7).
  • Fig. 7 we can appreciate how the mobile part (2) and the frame (3) itself are open and separated from the fixed part (1), with the assembly of the plastic part (10) and the coating (4) released from the mould.
  • the coating covers the front surface (12) of the polymer, the sides (13) that form the lateral surfaces of the said polymer, and a portion (14) of the rear surface of the said polymer.
  • Fig. 8 enables us to observe the treated surfaces (15, 16) of the frame (3) and of the fixed part (1) of the mould, along which the coating has to slide. As stated previously, these surfaces are polished with a treatment that favours sliding or with any other means that assists the sliding of the format.
  • Fig. 9 it is possible to appreciate the space (9) for the coating and for it to slide during the injection process, and how this space has direct access tom the cavity (6, 7).
  • the arrows indicate the essential areas that guarantee the flanging of the part in accordance with the diagrams shown.
  • Figs. 10 and 11 bring us closer to an awareness of the specific geometries or shapes of the possible flanging areas at 180° and 90° respectively, which are perfectly defined following the course of the present invention.

Abstract

A process for flanging injected plastic parts, provided with a coating (4), in which the said flanging is obtained in the operation itself of injecting the plastic polymer into the interior of a mould.

Description

  • The invention relates to the obtaining of injected plastic parts in the interior of a mould, which are coated and flanged inside the mould itself during the injection phase.
  • When a plastic part is coated, for example with a fabric, this coating adapts to the shape of the part, with the profile of the cut in the fabric remaining visible on the sharp edges of the part.
  • With the aim of rectifying this disadvantage and giving continuity to the surface of the fabric on the visible side of the part, the fabric has a greater surface area than is strictly necessary in order to cover the side of the part that is to be covered, making it possible therefore to pass the surplus part of the said fabric over the sharp edges and thus to join it, by different means or methods, to the unseen side of the part.
  • In the usual technical terminology, this operation is called flanging.
  • One of the processes used in order to obtain coated plastic parts is the injection of plastic onto the coating. This is the case of our solution, in which the process is divided into five phases:
  • A.- Placing the coating in the mould.
  • B.- Preshaping the coating.
  • C.- Closing the mould.
  • D.- Injection of the polymer onto the coating.
  • E.- Release of the coated part.
  • In this kind of process, and in order to ensure a good finish on the final part, so that neither the cut of the fabric nor the sharp edge of the part is visible, it is necessary to flange the coating over the part.
  • This operation is carried out after the injection, as another different process outside the injection machine and the mould. It is normally carried out by means of several techniques, among which we can point out:
    • Welding of the fabric onto the plastic part using ultrasounds.
    • Hot air welding.
    • Using adhesive.
  • Given that this operation is carried out after injection, it involves an increase in the number of tools, and, therefore, in their cost, as well as in operations, the use of skilled labour, longer cycle times, risk of quality defects, etc.
  • The object of the invention is to provide a process to obtain coated and flanged plastic parts in which the flanging of the coating is carried out inside the injection mould and at the same time as the injection itself, without the need for any tooling in addition to the mould nor for any operations other than the injection process.
  • In order to achieve this objective, the invention uses, as with the traditional technique, a mould for plastic injection, set up in an injection machine.
  • The mould is composed of a fixed part, a mobile part and a frame. The coating, suitably cut in terms of the geometry and development of the figure of the mould, is placed between the frame and the fixed part of the mould is placed. This suitably cut coating will be called "format".
  • At the start of the injection process, the first part of the mould that moves is the frame, which is to be supported on the fixed part of the mould, with the format thus remaining fixed onto the said fixed part.
  • In this arrangement, and in accordance with the invention, sufficient separation is left between the surfaces of the frame and of the fixed part so that the format is trapped, while at the same time it can also slide easily.
  • For this sliding to be guaranteed, the areas where the format comes into contact with the mould in the space between the frame and the fixed part must guarantee that it can slide, based on it being polishing, having a slide treatment, etc.
  • Following this, the mobile part is moved against the frame in order to close the mould and be able to begin the injection process.
  • In the injection process, the plastic in a melted state enters into the cavity in the mould for the part, reaching the format in such a way that, due to the injection pressure, the molten material gradually fills the cavity, pushing the coating so that it adapts top the geometry or shape of the said cavity.
  • The molten plastic gives a shape to the coating depending on the geometry of the cavity, with the flanging of this coating onto the part taking place as it adapts to this cavity.
  • The flanging takes place due to the specific geometry of the mobile part of he mould and of the frame, which forms another item claimed by the present invention.
  • Thus, the mobile part has the geometry of half of the cross section of the flanging area of the part to be flanged, while the frame has the geometry of the other half of the cross section of the flanging area of the part to be flanged, so that the front part, the sides and/or perimeter and at least a rear portion of the part to be coated become covered with the coating, without the need for any complementary operation in order to create the said flanging which is different from that of the injection phase.
  • The accompanying sheets of drawings show cross-section diagrams of the invention, in which the following are represented:
    • Figure 1 represents the configuration of the mould, the frame and the format.
    • Figure 2 represents the closure of the frame over the fixed part and the pre-shaping of the format
    • Figure 3 shows the mobile part of the mould over the frame and fixed part.
    • Figures 4, 5 and 6 show three successive progressive studies of the entry of the injected polymer.
    • Figure 7 represents the end of the process, with the mobile part of the mould and the frame separated from the fixed part of the mould
    • Figure 8 shows the surface treatment areas of the mould and the frame in order to favour the sliding of the format.
    • Figure 9, finally, is a representation of the flanging area of the assembly, without the inclusion of the plastic part or of the coating.
    • Figure 10 shows the flanging of the part at 180°.
    • Figure 11 shows the flanging of the part at 90°.
  • With reference to Fig. 1, we emphasise the fixed part of the mould (1), the mobile part of the mould (2), the frame (3) and the previously positioned format (4), for the start of the process. The fixed part provides one side of the geometry or shape of the part (5). The frame has the geometry of the perimeter of the part and adjusts to the fixed part while leaving a passage through the hole (8). The said frame includes one part of the flanging area (7).
  • In accordance with Fig. 2, the frame has approached the fixed part (1), pre-shaping the coating (4) and providing a distance (9) between both which allows the sliding of the format and prevents the molten plastic material from leaving.
  • The closing of the mobile part (2) of the mould onto the said assembly, Fig. 3, allows us to appreciate the establishment of the interior cavity (6, 7), carried out in two halves, one (6) for the mobile part and another (7) for the frame. The coating (4) remains trapped between the frame (3) and the fixed part (1), maintaining the separation distance (9) between the facing surfaces of these latter two parts, and with one portion of the coating having access to the interior of the cavity (6, 7).
  • The following entry of the injected material (10), in Figs. 4, 5 and 6, allows us to appreciate how, due to this action, the coating becomes adapted to the shape of the cavity (6, 7) by sliding in the space (9) in a gradual manner until the injected plastic completely fills the cavity.
  • In Fig. 7 we can appreciate how the mobile part (2) and the frame (3) itself are open and separated from the fixed part (1), with the assembly of the plastic part (10) and the coating (4) released from the mould. The coating covers the front surface (12) of the polymer, the sides (13) that form the lateral surfaces of the said polymer, and a portion (14) of the rear surface of the said polymer.
  • Fig. 8 enables us to observe the treated surfaces (15, 16) of the frame (3) and of the fixed part (1) of the mould, along which the coating has to slide. As stated previously, these surfaces are polished with a treatment that favours sliding or with any other means that assists the sliding of the format.
  • With regard to Fig. 9, it is possible to appreciate the space (9) for the coating and for it to slide during the injection process, and how this space has direct access tom the cavity (6, 7). The arrows indicate the essential areas that guarantee the flanging of the part in accordance with the diagrams shown.
  • Figs. 10 and 11 bring us closer to an awareness of the specific geometries or shapes of the possible flanging areas at 180° and 90° respectively, which are perfectly defined following the course of the present invention.

Claims (7)

  1. Procedure to obtain injected plastic parts, coated and flanged, that uses a fixed part (1) of a mould and another mobile part (2), with the intervention between them of an intermediate frame (3), with a coating (4) being placed between the frame and the fixed part, and this coating being previously shaped between them, with the mobile part (2) then being closed onto the frame (3) in order to carry out the injection of the plastic material, and with the coating (4) being included in the space (9) that exists between the said frame and the said fixed part and with a cavity (6, 7) provided between the fixed part and the frame, which is characterised in that
    the space (9) between the fixed part (1) of the mould and the frame (3), in which the perimeter of the coating (4) is placed, enables the sliding of the coating inside this space, and at the same time prevents the plastic in molten form from leaving when injection takes place,
    the space (9) opens into the interior of the cavity (6, 7) in such a way that its geometry or shape is defined by the mark on the mobile part (6), the mark on the frame (7) and the portion (5) of the fixed part.
    the geometry of the cavity (6) in the mobile part (2) of the mould corresponds to half of the cross section of the part to be flanged and the geometry of the cavity in the frame corresponds to the other half.
  2. Procedure to obtain injected plastic parts, coated and flanged, in accordance with claim 1, characterised in that the geometries or shapes of either of the two cavities (6, 7) can be different from the 50% shown for the cross section of the part to be flanged, in that the partition line between the fixed part and the mobile part can be between the area indicated by line (A) and line (B).
  3. Procedure to obtain injected plastic parts, coated and flanged, in accordance with claim 1, characterised in that the walls (15) of the frame (3) and the walls (16) of the fixed part (1) of the mould, which are facing each other, receiving the coating (4), are suitably prepared in order to guarantee that the said coating will slide on them.
  4. Procedure to obtain injected plastic parts, coated and flanged, in accordance with claim 1, characterised in that the geometry of the flanging area makes it possible to carry out this operation along the front surface, perimeter and rear unseen surface of the part, which is called 180° flanging.
  5. Procedure to obtain injected plastic parts, coated and flanged, in accordance with claim 1, characterised in that the geometry of the flanging area makes it possible to flange along the front surface and perimeter of the part, which is called 90° flanging.
  6. Injected plastic part, coated and flanged, with a base (10) made of plastic and a coating (4), which is characterised in that the rear flanging (11) is obtained in the injection operation itself, with this flanging occupying the front exterior, the lateral perimeter and at least a rear portion of the coated part close to its side.
  7. Injected plastic part, coated and flanged, with a base (10) made of plastic and a coating (4), which is characterised in that the flanging is obtained in the injection operation itself, with this flanging occupying the front exterior and the lateral perimeter
EP01275058A 2001-11-26 2001-11-26 Method of obtaining flanged, coated plastic parts Expired - Lifetime EP1468806B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2001/000456 WO2003053652A1 (en) 2001-11-26 2001-11-26 Method of obtaining flanged, coated plastic parts

Publications (2)

Publication Number Publication Date
EP1468806A1 true EP1468806A1 (en) 2004-10-20
EP1468806B1 EP1468806B1 (en) 2010-05-05

Family

ID=8244403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01275058A Expired - Lifetime EP1468806B1 (en) 2001-11-26 2001-11-26 Method of obtaining flanged, coated plastic parts

Country Status (6)

Country Link
EP (1) EP1468806B1 (en)
AT (1) ATE466715T1 (en)
AU (1) AU2002220760A1 (en)
DE (1) DE60142088D1 (en)
ES (1) ES2340837T3 (en)
WO (1) WO2003053652A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2163993B (en) * 1983-09-02 1988-08-10 Budd Co Sheet molding & apparatus
JPH0262215A (en) * 1988-08-29 1990-03-02 Koatsu Kako Kk Composite resin molded item and manufacture thereof
JPH0473115A (en) * 1990-07-16 1992-03-09 Kyowa Kogyo Kk Method of simultaneously molding synthetic and non-synthetic resin materials
DE4127241C2 (en) * 1991-08-17 1994-06-01 Bayer Ag Process for producing molded parts with a surface covered by decorative material by back injection, and molds for carrying out the process
JP2834671B2 (en) * 1994-05-27 1998-12-09 株式会社イノアックコーポレーション Method for producing plastic molded article having foam with skin on surface and foaming mold used therefor
US5599608A (en) * 1995-06-20 1997-02-04 Green Tokai Co., Ltd. Method of insert molding plastic parts to provide covered edge surfaces and plastic parts made thereby
US6143227A (en) * 1997-07-30 2000-11-07 Visteon Global Technologies, Inc. Method for injection molding an article having film covered flanges

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03053652A1 *

Also Published As

Publication number Publication date
ES2340837T3 (en) 2010-06-10
DE60142088D1 (en) 2010-06-17
EP1468806B1 (en) 2010-05-05
ATE466715T1 (en) 2010-05-15
WO2003053652A1 (en) 2003-07-03
AU2002220760A1 (en) 2003-07-09

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